Now, as a math teacher, "differentiation of product" means something completely different... but for this purpose it means -- don't expect every student to respond to your request for evidence of understanding with the same learning artefact. This is well stolen from Vanderbilt University (https://iris.peabody.vanderbilt.edu/module/di/cresource/q2/p07/ ) Now, even as a first year teacher way back in the 90s before I really knew about differentiation of product, I encouraged students to present their mathematics projects as diversely as possible. But OneNote has truly given them complete freedom and ease of submission. Inking -- first & foremost, student mathematical work tends to be handwriting. Most of my students don't know LaTeX (although I have had a few of my students, from Grade 9 and up, learn it once they were told it existed and was what 'real' mathematics authors use. Interestingly, OneNote (and Word & PowerPoint) supports LaTeX . ...
...not something ready-made, but something in continuous formation through choice of action. J. Dewey